348 Harshberger on Relation of Ice Storms to Trees. 



a lateral one, and weigh it surrounded by its sheath of ice. 

 The ice was permitted to melt, the branches or twigs were 

 then dried and carefully weighed. The difference in the 

 weighings corresponds with the weight of the ice. A ratio 

 was then calculated which expresses approximately the 

 relativity of the force brought to bear upon the branches or 

 twigs of the different trees. The accompanying table pre- 

 sents the results of the study : 



No. 



Name of Plant. 



Pi 



I — Rhododendron maximum 

 2 — Rhododendron maximum 



3 — Tilia Americana 



4 — Populus nigra Italica . . . 



5 — Liriodendron tulipifera. . 



6 — Betula lutea 



7 — Madura aurantiaca 



8 — Populus monilifera 



9 — Paulownia imperialis . . . 

 10 — Juniperus Virginiana . . . 



II — Pinus rigida 



12 — Picea alba 



13 — Picea nigra 



14 — Aesculus hippocastanum. 



15 — Acer dasycarpum 



16 — Platanus occidentalis . . . 



17 — Ulmus Americana 



18 — Grass blade 



1:25 



1:3s 



8 

 II 



45 

 14 

 9 

 6 



4-5 



23 



9 



13 



8 



3 

 8 



5 



12 



10 



These ratios do not express the relation of the breaking 

 weight, because in all cases the branches, some of which 

 were considerably bent down by the storm, were removed 

 before they were broken off. However, the damage during 



